test: setup E2E tests for ORAS

[qweeah]

This PR introduces E2E testing based on ginkgo and gomega. E2E tests will be run against ORAS binary built during Build CLI step and latest oras-distribution container with below changes:

• Build CI action: Added start & stop steps for backend distribution
• Test: added E2E tests running together with unit tests during make test
  • Two test suites: TestORASCommands for single command tests and TestORASScenarios for scenario-based tests
  • Testing utilities: added command execution helper types and funcs, as well as a output matcher package.

Now the PR also contains sample e2e tests for:

1. login & logout commands, as well as failure checks for all commands after logging out .
2. helper doc check for manifest fetch command

To run the tests, a guide can be found in here. related to #523

[codecov-commenter]

Codecov Report

Merging #528 (c25eb1e) into main (9a014d6) will increase coverage by 5.92%. The diff coverage is 98.29%.

@@            Coverage Diff             @@
##             main     #528      +/-   ##
==========================================
+ Coverage   70.72%   76.65%   +5.92%     
==========================================
  Files          11       14       +3     
  Lines         427      544     +117     
==========================================
+ Hits          302      417     +115     
- Misses        101      102       +1     
- Partials       24       25       +1     

Impacted Files	Coverage Δ
test/e2e/scenario/oras_artifact.go	96.87% <96.87%> (ø)
test/e2e/command/manifest.go	100.00% <100.00%> (ø)
test/e2e/scenario/auth.go	100.00% <100.00%> (ø)

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[qweeah]

Closing this, will add another PR for testing utilities